Sonoff PSF-B Series

Transmit power
802.11b: 20±2dBm (@11Mbps) 802.11g: 17±2dBm (@54Mbps)
802.11n: 14±2dBm (@HT 20, MCS 7)
Receiving
sensitivity
802.11b: -91 dBm (@11 Mbps, CCK) 802.11g: -75 dBm (@54Mbps,
OFDM) 802.11n: -72 dBm (MCS7)
Antenna type
Ceramic patch antenna
3.Module Type and Pin Definition
3.1 Module type
PSF-B04 top view
3.2 Sequence of pin arrangement
PSF-B04 module provides 4-channel switch control interface, Wi-Fi status
light interface, UART serial port.
Top view of module pins: